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Article

Large-Scale Particle Image Velocimetry for Estimating Vena-Contracta Width for Flow in Contracted Open Channels

Department of Civil and Environmental Engineering, Colorado State University, 1372 Campus Delivery, Fort Collins, CO 80523-1372, USA
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Water 2021, 13(1), 31; https://doi.org/10.3390/w13010031
Received: 6 November 2020 / Revised: 15 December 2020 / Accepted: 23 December 2020 / Published: 26 December 2020
(This article belongs to the Special Issue Measurements and Instrumentation in Hydraulic Engineering)
This paper presents the findings of a flume study using large-scale particle velocimetry (LSPIV) to estimate the top-width of the vena contracta formed by an approach open-channel flow entering a contraction of the channel. LSPIV is an image-based method that non-invasively measures two-dimensional instantaneous free-surface velocities of water flow using video equipment. The experiments investigated the requisite dimensions of two essential LSPIV components—search area and interrogation area– to establish the optimum range of these components for use in LSPIV application to contractions of open-channel flows. Of practical concern (e.g., bridge hydraulics) is flow contraction and contraction scour that can occur in the vena contracta region. The study showed that optimum values for the search area (SA) and interrogation area (IA) were 10 and 60 pixels, respectively. Also, the study produced a curve indicating a trend for vena-contracta width narrowing with a variable ratio of approach-channel and contracted-channel widths and varying bed shear stress of approach flow. View Full-Text
Keywords: LSPIV; contracted open channels; vena contracta width; search area; interrogation area LSPIV; contracted open channels; vena contracta width; search area; interrogation area
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MDPI and ACS Style

Fakhri, A.; Ettema, R.; Aliyari, F.; Nowroozpour, A. Large-Scale Particle Image Velocimetry for Estimating Vena-Contracta Width for Flow in Contracted Open Channels. Water 2021, 13, 31. https://doi.org/10.3390/w13010031

AMA Style

Fakhri A, Ettema R, Aliyari F, Nowroozpour A. Large-Scale Particle Image Velocimetry for Estimating Vena-Contracta Width for Flow in Contracted Open Channels. Water. 2021; 13(1):31. https://doi.org/10.3390/w13010031

Chicago/Turabian Style

Fakhri, Alireza, Robert Ettema, Fatemeh Aliyari, and Alireza Nowroozpour. 2021. "Large-Scale Particle Image Velocimetry for Estimating Vena-Contracta Width for Flow in Contracted Open Channels" Water 13, no. 1: 31. https://doi.org/10.3390/w13010031

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